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Use vfork() improve performance when starting processes.#33289

Merged

stephentoub merged 10 commits intodotnet:masterfrom

joshudson:vfork

Feb 15, 2019

Commits on Nov 7, 2018

Use vfork() to start child processes where this yields a performance improvement due to getting rid of page faults.
joshudson
committed

Commits on Nov 13, 2018

Remove specific dependency on shared memory vfork so that cross compiles work again.
joshudson
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Commits on Dec 14, 2018

Added signal mask code so that a child process can't confuse the parent; also took care of pthread cancellation mask in case third-party native code tries to use it
joshudson
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Commits on Dec 23, 2018

Fix issues from vfork() pull request review
joshudson
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Commits on Jan 6, 2019

Check handler before replacing it
joshudson
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Commits on Jan 8, 2019

Improve readability of signal handler removing
joshudson
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Commits on Jan 10, 2019

Convert tabs to spaces
joshudson
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Commits on Jan 28, 2019

use NSIG instead of dynamic probing because glibc punches a hole in the middle of the signal list
joshudson
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Commits on Feb 10, 2019

Exclude Mac OSX from vfork() because we don't quite trust it.
joshudson
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Commits on Feb 12, 2019

Fix one last batch of typos
joshudson
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